An asterisk* after the cartridge name indicates that the above dimensions have been obtained from actual reamer prints. The others are from the best reliable sources available to me. Remember, many of these are wildcats and therefore non-standard so the dimensions may vary. Special thanks to the members of the Saubier small caliber forums and to Pacific Tool & Gauge for their assistance.

The 20 Duster dimensions are from PT&G prints 2933 (1) and 5353 (2). As you can see, the dimensions are different but both are referred to as 20 Duster.